We've all heard these pieces of diet advice. The problem: They're not always true.

1. Dry-roasted nuts have fewer calories than oil-roasted.

1. Dry-roasted nuts have fewer calories than oil-roasted.

Technically, they do, but the difference is tiny (seven calories for a one-ounce serving). What does make a difference: Eating too many nuts of any type. Limit your daily nibbles to one ounce and preferably to one of the heart-healthy choices like almonds or walnuts.